Created
June 21, 2022 02:09
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| #include <thread> | |
| #include <mutex> | |
| #include <condition_variable> | |
| class worker_thread { | |
| std::thread thread; | |
| std::mutex mx; | |
| std::condition_variable cv; | |
| bool start = false, done = true, stop = false; | |
| public: | |
| template <typename F, typename... Args> | |
| worker_thread(F&& f, Args&&... args) | |
| : thread([this]<typename... Args2>(auto&& f, Args2&&... args){ | |
| for (;;) { | |
| { std::unique_lock lock(mx); | |
| cv.wait(lock,[this]{ return start || stop; }); | |
| start = false; | |
| if (stop) break; | |
| } | |
| f(static_cast<Args2&&>(args)...); | |
| { std::unique_lock lock(mx); | |
| done = true; | |
| } | |
| cv.notify_all(); | |
| } | |
| }, static_cast<F&&>(f), static_cast<Args&&>(args)...) { } | |
| template <typename F, typename... Args> | |
| void operator()(F&& f, Args&&... args) { | |
| { std::unique_lock lock(mx); | |
| cv.wait(lock,[this]{ return done; }); | |
| f(static_cast<Args&&>(args)...); | |
| start = true; | |
| done = false; | |
| } | |
| cv.notify_all(); | |
| } | |
| ~worker_thread() { | |
| { std::unique_lock lock(mx); | |
| cv.wait(lock,[this]{ return done; }); | |
| stop = true; | |
| done = false; | |
| } | |
| cv.notify_all(); | |
| thread.join(); | |
| } | |
| }; | |
| #include <iostream> | |
| #include <chrono> | |
| int main(int argc, char* argv[]) { | |
| static int val; | |
| worker_thread worker([]{ | |
| std::this_thread::sleep_for(std::chrono::seconds(1)); | |
| std::cout << val << std::endl; | |
| }); | |
| for (int i=0; i++ < 1'000'000; ) { | |
| if (i%200'000 == 0) { | |
| worker([&]{ val = i; }); | |
| } | |
| } | |
| } |
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